What describes heat rash?

Heat rash, also known as miliaria, is characterized by a red, raised rash that develops when sweat becomes trapped in the sweat ducts. This condition occurs during hot and humid weather, and it typically presents with a prickling or tingling sensation, especially when the skin is sweaty. The trapped sweat leads to inflammation of the surrounding skin, causing the characteristic rash.

The presence of a prickling sensation indicates that the individual is experiencing irritation on the skin, which is a direct result of the heat and humidity causing sweat to accumulate instead of evaporating. This condition is usually mild, but it's important to manage it to prevent further skin issues or complications.

Other options describe different conditions or sensations that do not align with heat rash. Localized pain and muscle cramps pertain more to heat-related illnesses such as heat cramps. A painful burning sensation on the skin could indicate a sunburn or other skin-related issues, while severe dehydration and skin flaking are not typical features associated specifically with heat rash, but rather with more severe heat illnesses or skin conditions that require different management.